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Physics (AS & A Level) · May / June 2017 · Paper 13 · Question 33

9702Resistance and resistivity

A metal cube with sides of length a has electrical resistance R between opposite faces. [diagram of a cube with side a, with leads attached to opposite faces] What is the resistance between the opposite faces of a cube of the same metal with sides of length 3a?

  1. A9R
  2. B3R
  3. C\frac{R}{3}
  4. D\frac{R}{9}

As printed in the paper

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Correct answer: C. \frac{R}{3}

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